Insiders / Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
CIK 1903360unknownbeneficial ownerinsider
Companies
6
First seen
Sep 14, 2023
Last activity
Aug 13, 2026
Companies
| Company | Shares held | Latest |
|---|---|---|
| Metsera, Inc. · MTSR | 1,857,699 | — |
| MBX Biosciences, Inc. · MBX | 1,790,122 | — |
| RayzeBio, Inc. · RYZB | 1,557,846 | — |
| Avalyn Pharma Inc. · AVLN | 1,275,486 | — |
| Upstream Bio, Inc. · UPB | 894,733 | — |
| CARGO Therapeutics, Inc. · CRGX | 737,000 | — |
All securities held
6 positions · latest reported per filing
Shares
| Company | Security | Shares |
|---|---|---|
| Avalyn Pharma Inc. | Common stock | 1,275,486 |
| CARGO Therapeutics, Inc. | Common stock | 737,000 |
| MBX Biosciences, Inc. | Common stock | 1,790,122 |
| Metsera, Inc. | Common stock | 1,857,699 |
| RayzeBio, Inc. | Common stock | 1,557,846 |
| Upstream Bio, Inc. | Common stock | 894,733 |
Ownership percentages elsewhere on the site count common and ordinary shares only, because that is what shares outstanding are measured in. Everything above is a real holding; not all of it is a share of the company.
Activity
InsidersInstitutions
This person's trades in company stock, across every company.| Date | Action | Company | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|
| Oct 15, 2024 | Other Derivative conversion | UPB Upstream Bio, Inc. Series B redeemable convertible preferred stock | — | -853K -100.00% | 0 0.00% of shares | low |
| Oct 15, 2024 | Other Derivative conversion | UPB Upstream Bio, Inc. Common Stock | — | +895K | 894,733 1.63% of shares | low |
| Jan 30, 2025 | Other Derivative conversion | MTSR Metsera, Inc. Series B Preferred Stock | — |